site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=vNBkaEW99ExSv7hXrVNNgV0SZiwcUj14wanCsiMt98M=; b=LPkzbB+vugOTjgslfJEY2Xh0GHEs2HCZreqdtJiNYL1zHNPZjqonsdRjA3xaQg36wk m8FODii0BE5Us6qyf8ZBVdRKu6RL8NjXfBYRGKyjT6WsXOZheLFC0GLqOUYC+2CH4DS2 5YbvOIunkWXE+N73FZdm/7bCOp+VXVj0yiZLQ= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=Z5KT0PADHn/+Pob24nfp6NEq0itMOKBu2euSTdLeP162pbgULBjbPLA/Tdf3z8WSic BhMLJsrqZYmfieyCSdumZBzLIx4yq+XmRiNH3kl9Hc48/c3PYYu6SgmvHgH9Fy7OFmXh KYUTx/jq/vInT8UNOj2lnHIebDN7Dq0lRXeHc= On Wed, Jan 7, 2009 at 12:27 AM, searockcliff <searockcliff@163.com> wrote:

Hi All, I meet one kernel panic. When I begin to debug the kernel, I cannot get the back trace. All the backtrace in panic log is about panic handling, except the 0x0 instruction : 0x85666a18 : 0x0 (0xe 0xe9660048 0xefd10010 0xd8330010) I find one application's kernel_stack is wrong too. task vm_map ipc_space #acts pid proc command 0x0e58e770 0x0e5d1b40 0x0dc611cc 3 2528 0x0dfc7750 TESTAPP thread processor pri state wait_queue wait_event 0x0e5964f0 0x7c361000 31 R kernel_stack=0x85664000 stacktop=0x00000000 stackbottom=0xfffffff0 Could anybody give some hint about how to continue my kernel debug? Thanks a lot!

dump the memory starting at the kernel_stack address and see if you can manually decode stack frames. Something has destroyed your stack.

Mon Jan 5 16:50:55 2009 panic(cpu 0 caller 0x001A8CEC): Kernel trap at 0x00000000, type 14=page fault, registers: CR0: 0x8001003b, CR2: 0x7c794000, CR3: 0x00f3b000, CR4: 0x00000660 EAX: 0x00000000, EBX: 0x0042ec54, ECX: 0x00000000, EDX: 0x0dd09b00 CR2: 0x00000000, EBP: 0x00000000, ESI: 0x00000144, EDI: 0xffff0000 EFL: 0x00010212, EIP: 0x00000000, CS: 0x00000008, DS: 0x8f900010 Error code: 0x00000010 Backtrace (CPU 0), Frame : Return Address (4 potential args on stack) 0x856668d8 : 0x12b0fa (0x459234 0x8566690c 0x133243 0x0) 0x85666928 : 0x1a8cec (0x4627a0 0x0 0xe 0x461f50) 0x85666a08 : 0x19eed5 (0x85666a20 0x75fdcf03 0x0 0x0) 0x85666a18 : 0x0 (0xe 0xe9660048 0xefd10010 0xd8330010) Backtrace terminated-invalid frame pointer 0 BSD process name corresponding to current thread: SntlKeysSrvrmac Mac OS version: 9F33 Kernel version: Darwin Kernel Version 9.5.0: Wed Sep 3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386 System model name: MacPro3,1 (Mac-F42C88C8)

Something has jumped to location zero. You should dump the memory for the stack frames x/256x 0x856668d8 and manually decode the stack frame instead. Frames usually begin at 0x???????8, and the first word is a pointer to the next frame. You can also try repeatedly issuing an "x/a" command on the memory of the stack and see if any symbols match, i.e. the last known good frame is 0x85666a18, so x/a 0x85666a18 [return to repeat the command for the next address] [return to repeat the command for the next address] [return to repeat the command for the next address] [return to repeat the command for the next address] [return to repeat the command for the next address] [return to repeat the command for the next address] etc. Good luck. A trashed stack can be very tedious to diagnose. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com